A conclusion that is devoutly to be wished, by anyone who genuinely respects individual liberty ... and that is already recognized by the Ninth and Fourteenth Amendments ... and that is exceedingly, and unfortunately, unlikely.
In any event, the removal of such differentiation under the law is akin to outlawing Jim Crow restrictions as to race, not "creating a protected class." It involves a restriction that is placed upon one class of persons being removed, not a privilege that is granted to such a class.
What this does as to federalism is indeed problematic -- but we have the Fourteenth Amendment, and an entirely reasonable case can be (and has been) made that setting up penalties for one class of people as to consensual acts is not "due process of law."
Premises, premises. Similar desire and behavior does not make you a "class."